Issues

• Long-form inputs: tables as bounds, coefficients, constants and rhs; relation group-by

  refactorsparse
  PyPSA/linopy#1049 · Filter by author FabianHofmann opened on Oct 22, 2026
  1

• One netcdf layout for constraints and expressions written from the store

  refactorsparse
  PyPSA/linopy#1048 · Filter by author FabianHofmann opened on Oct 22, 2026

• One Constraint class: delete CSRConstraint, ConstraintBase and the freeze API

  refactorsparse
  PyPSA/linopy#1047 · Filter by author FabianHofmann opened on Oct 22, 2026

• Constraint over lhs: lhs + sign + rhs + labels with derived data (dense store)

  refactorsparse
  PyPSA/linopy#1046 · Filter by author FabianHofmann opened on Oct 22, 2026

• Model.store_cls as the construction seam; Store.to_sparse(reason) for mixed operands

  refactorsparse
  PyPSA/linopy#1045 · Filter by author FabianHofmann opened on Oct 22, 2026

• Conformance suite over dense and sparse backends with a layout-free assert_equivalent

  refactorsparse
  PyPSA/linopy#1044 · Filter by author FabianHofmann opened on Oct 22, 2026

• CSR constraints: support update() instead of raising frozen errors

  enhancementsparse
  PyPSA/linopy#1033 · Filter by author FabianHofmann opened on Oct 18, 2026

• Store protocol for LinearExpression: DenseStore and CSRStore behind one interface, fallback in the base class

  refactorsparse
  PyPSA/linopy#1020 · Filter by author FabianHofmann opened on Oct 7, 2026

• Meta: separate dense and sparse stores from the expression and constraint frontend

  discussionrefactorsparse
  PyPSA/linopy#1019 · Filter by author FabianHofmann opened on Oct 7, 2026
  1

• spec: rows emptied by absence are dropped silently; revisit strict refusal

  discussionmath-spec
  PyPSA/linopy#993 · Filter by author FabianHofmann opened on Sep 28, 2026
  2

• Make the sparse path observable and controllable (.is_sparse, densify warning, per-call sparse=)

  enhancementsparse
  PyPSA/linopy#969 · Filter by author FabianHofmann opened on Sep 22, 2026

• add_piecewise_formulation use case: snapshot-dimensioned breakpoints (PyPSA/PyPSA#1914)

  enhancementmodel formulation
  PyPSA/linopy#953 · Filter by author MaykThewessen opened on Sep 10, 2026

• Mosek output not shown in console when log_fn is set

  bugsolver interface
  PyPSA/linopy#948 · Filter by author mgrabovsky opened on Sep 8, 2026

• Zero culling forces model rebuilding

  bugdata-modelperformance
  PyPSA/linopy#925 · Filter by author olivier-lacroix opened on Sep 4, 2026
  1

• spec: grouped operators crash on string labels under pandas 3.0 (ArrowStringArray)

  bugmath-spec
  PyPSA/linopy#924 · Filter by author FabianHofmann opened on Sep 4, 2026

• Math-spec integration

  enhancementmath-spec
  PyPSA/linopy#919 · Filter by author FabianHofmann opened on Sep 3, 2026
  2

• Add LazyExpresssions

  data-modelenhancementmath-spec
  PyPSA/linopy#888 · Filter by author brynpickering opened on Aug 12, 2026

• Move to mkdocs (or equivalent) for docs

  documentation
  PyPSA/linopy#873 · Filter by author brynpickering opened on Jul 27, 2026 · Post v1
  3

• Plan: v1 semantics community discussion (open after #717 merges)

  discussionmodel formulationv1
  PyPSA/linopy#857 · Filter by author FBumann opened on Jul 20, 2026

• Add a mask parameter to add_piecewise_formulation

  enhancementmodel formulation
  Feature

  PyPSA/linopy#799 · Filter by author FBumann opened on Jun 29, 2026

• Design: Model.restrict / advance — slice a model along a coordinate and condition on boundary values (rolling horizon)

  data-modeldiscussionenhancementperformance
  PyPSA/linopy#768 · Filter by author FabianHofmann opened on Jun 7, 2026
  11

• Split dev-facing extras into PEP 735 dependency groups (and the pip ≥ 25.1 implication)

  dependenciesrefactor
  PyPSA/linopy#763 · Filter by author FBumann opened on Jun 5, 2026

• groupby-sum pads every group to the largest group size

  data-modelenhancementperformance
  PyPSA/linopy#745 · Filter by author FBumann opened on Jun 3, 2026 · Resolve Memory issues in sparse models
  1

• Tighten type hints on add_variables / add_constraints / add_objective

  data-modelrefactor
  PyPSA/linopy#734 · Filter by author FBumann opened on May 27, 2026
  1

• Variable.update() / Constraint.update() should validate inputs the same way add_variables() / add_constraints() do

  data-modelenhancement
  PyPSA/linopy#731 · Filter by author FBumann opened on May 27, 2026